usr/src/lib/libsocket/inet/getservent_r.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  *
  25  * lib/libsocket/inet/getservent_r.c
  26  *
  27  * This file defines and implements the re-entrant enumeration routines for
  28  *   services: setservent(), getservent_r(), and endservent(). They consult
  29  *   the switch policy directly and do not "share" their enumeration state
  30  *   nor the stayopen flag with the implentation of the more common
  31  *   getservbyname_r()/getservbyport_r(). The latter follows a tortuous
  32  *   route in order to be consistent with netdir_getbyYY() (see
  33  *   getservbyname_r.c and lib/libnsl/nss/netdir_inet.c).
  34  */
  35
  36 #pragma ident   "%Z%%M% %I%     %E% SMI"
  37
  38 #include <sys/types.h>
  39 #include <nss_dbdefs.h>
  40
  41 /*
  42  * str2servent is implemented in libnsl, libnsl/nss/netdir_inet.c, since
  43  * the "engine" of the new gethost/getserv/netdir lives in libnsl.
  44  */
  45 int str2servent(const char *, int, void *, char *, int);
  46
  47 /*
  48  * Unsynchronized, but it affects only
  49  * efficiency, not correctness.
  50  */
  51 static int services_stayopen;
  52 static DEFINE_NSS_DB_ROOT(db_root);
  53 static DEFINE_NSS_GETENT(context);
  54
  55 void
  56 _nss_initf_services(nss_db_params_t *p)
  57 {
  58         p->name = NSS_DBNAM_SERVICES;
  59         p->default_config = NSS_DEFCONF_SERVICES;
  60 }
  61
  62 int
  63 setservent(int stay)
  64 {
  65         services_stayopen |= stay;
  66         nss_setent(&db_root, _nss_initf_services, &context);
  67         return (0);
  68 }
  69
  70 int
  71 endservent()
  72 {
  73         services_stayopen = 0;
  74         nss_endent(&db_root, _nss_initf_services, &context);
  75         nss_delete(&db_root);
  76         return (0);
  77 }
  78
  79 struct servent *
  80 getservent_r(struct servent *result, char *buffer, int buflen)
  81 {
  82         nss_XbyY_args_t arg;
  83         nss_status_t    res;
  84
  85         NSS_XbyY_INIT(&arg, result, buffer, buflen, str2servent);
  86         /*
  87          * Setting proto to NULL here is a bit of a hack since we share
  88          * the parsing code in the NIS+ backend with our getservbyYY()
  89          * brethren who can search on 1-1/2 key. If they pass a NULL
  90          * proto, the parsing code deals with it by picking the protocol
  91          * from the first NIS+ matching object and combining all entries
  92          * with "that" proto field. NIS+ is the only name service, so far,
  93          * that can return multiple entries on a lookup.
  94          */
  95         arg.key.serv.proto      = NULL;
  96         /* === No stayopen flag;  of course you stay open for iteration */
  97         res = nss_getent(&db_root, _nss_initf_services, &context, &arg);
  98         arg.status = res;
  99         return (struct servent *)NSS_XbyY_FINI(&arg);
 100 }